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The given graph/data I,II,III and IV re...

The given graph/data I,II,III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure . Which of the following choice(s) about I,II,III, and IV is/are correct ?

A

I is physisorption and II is chemisorption

B

I is physisorption and III is chemisorption

C

IV is chemisorption and II is chemisorption

D

IV is chemisorption and III is chemisorption

Text Solution

Verified by Experts

The correct Answer is:
A, C
In physisorption on increasing temperature at constant pressure, adsorption decreases while in chemical adsorption on increasing temperature due to requirement of activation energy adsorption will increase at same pressure. SO, I is physisorption while II is chemisorption.
III is physical adsorption as on increasing temperature, extent of adsorption is decreasing.
IV is representing enthalpy change (which is high) during chemical adsorption (due to bond formation) So, is valid for chemical adsorption. So, answer is (A) and (C)
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